BAD QUALITY CLOTHING

I bought 10 shirts/tops on the 27th of November 2015. We left for holiday on the 8th of December to go overseas and I bought these tops for the holiday. I wore the first one on the day we left and realised they did not fit properly. We were already on our way to the airport. by that time we have washed all of them and now I don't have the tags any more. We arrived back in SA and left for the coast and got back last week. I should probably go back to the store but I don't have the energy to try and explain myself and my dissatisfaction to the people in the store if I don't have the receipt and the tags. I cant wear any of them and would like to return them. I found 3 of the tags. I hope someone can get back to me regarding this. I considered asking someone to try and fix but why should I fix 10 brand new shirts. The size is right but the straps are to long and if i pull the shirt down so that the strap part fits the gap under my arms are so big that you can see my underwear. the top is not in proportion at all. Maybe buying cheap is a expensive mistake...